Foldable jogging machine

ABSTRACT

A foldable jogging machine comprises a handrail frame, and a machine stand which is formed of a front machine stand and a rear machine stand. The front and the rear machine stands are provided with a spindle. The spindles are driven by a motor via a track. The front and the rear machine stands are mounted pivotally on a swiveling shaft such that they can be folded. The front machine stand is connected with an elevating leg frame for bringing about a reverse moment of force relative to the swiveling shaft, so as to cancel out a forward moment of force which is brought about in relation to the swiveling shaft by the jogging machine and the weight of a user of the jogging machine.

FIELD OF THE INVENTION

[0001] The present invention relates generally to a jogging machine, andmore particularly to a foldable jogging machine.

BACKGROUND OF THE INVENTION

[0002] A foldable jogging machine of the prior art comprises a joggingset and a support structure. The jogging set is formed of a powermechanism, a cyclic belt, and an outer frame. The support structure isformed of a main support rod, a front fork, and a pull rod. The frontfork is pivoted to the midsection of the main support rod. The mainsupport rod and the bottom side of the front fork are pivotedrespectively with the pull rod and the jogging set. The pull rod isfastened pivotally at other end with the jogging set. When the joggingset is lifted, the main support rod is drawn by the pull rod to movetoward the front fork. In light of the jogging set being pivoted withthe front fork by a pivot, a greater moment of force is brought about atthe pivoting point at the time when an exerciser is doing a joggingexercise on the jogging set. As a result, the machine frame is apt todeform.

SUMMARY OF THE INVENTION

[0003] The primary objective of the present invention is to provide afoldable jogging machine which is free from the structural deficiency ofthe prior art foldable jogging machine described above.

[0004] The foldable jogging machine of the present invention comprises ahandrail frame and a machine stand which is formed of a front machinestand and a rear machine stand. The front and the rear machine standsare provided with a spindle. The spindles are driven by a motor via atrack. Located in the proximity of the front and the rear spindles is aswiveling shaft enabling the front and the rear machine stands to befolded. An elevating leg frame is connected with the front machine standfor bringing about a reverse moment of force relative to the swivelingshaft, so as to cancel out a forward moment of force brought about bythe jogging machine and the weight of a user of the machine in relationto the swiveling shaft.

BRIEF DESCRIPTION OF THE DRAWINGS

[0005]FIG. 1 shows a perspective view of the present invention.

[0006]FIG. 2 shows a side schematic view of the present invention.

[0007]FIG. 3 shows a schematic view of a fixation mechanism of thepresent invention.

[0008]FIG. 4 shows a schematic view of the folding of the presentinvention.

[0009]FIG. 5 shows a schematic view of the elevating leg frame of afirst preferred embodiment of the present invention in action.

[0010]FIG. 6 shows a schematic view of the elevating leg frame of asecond preferred embodiment of the present invention in action.

DETAILED DESCRIPTION OF THE INVENTION

[0011] As shown in FIGS. 1-3, a foldable jogging machine 20 of thepresent invention comprises a handrail frame 30, a machine stand 40, andan elevating leg frame 60.

[0012] The machine stand 40 is formed of a front machine stand 41 and arear machine stand 42. The front machine stand 41 is fastened with thehandrail frame 30 and is provided with a front spindle 43, atransmission mechanism 44, a swiveling shaft 45, and a connection piece46. The connection piece 46 is provided with two locating holes 461 and462. The transmission mechanism 44 is formed of an oil pressure cylinder47 and a piston rod 48. The transmission mechanism 44 is intended toprovide the elevating leg frame 60 with a driving force to cause theelevating leg frame 60 to move up and down.

[0013] The rear machine stand 42 is pivoted with the swiveling shaft 45of the front machine stand 41 such that the rear machine stand 42 can beswiveled to be coplanar with the front machine stand 41. The rearmachine stand 42 is provided with a rear spindle 49 and a fixationmechanism 51. The fixation mechanism 51 has an insertion pin 52 and aspring 53 urging the insertion pin 52. The insertion pin 52 can be drawninto or out of the locating holes 461 and 462 of the connection piece 46by a steel cable 54 which is put through the spring 53. The steel cable54 is fastened at other end with a control knob 55 of the rear machinestand 42. The control knob 55 is slidably disposed in a slide slot 56.

[0014] The elevating leg frame 60 is of an L-shaped construction and isfastened pivotally at the top end with a pivoting point 61 of the frontmachine stand 41, and at the bottom end thereof with a moving wheel 62which is located behind the swiveling shaft 45. The elevating leg frame60 is fastened at the center with the piston rod 48 of the transmissionmechanism 44. The piston rod 48 is actuated by the oil pressure cylinder47 to pull the elevating leg frame 60 so as to adjust the height of themachine stand 40.

[0015] As illustrated in FIG. 4, the jogging machine 20 of the presentinvention is folded by pulling outward the control knob 55 first beforepushing the control knob 55 along the slide slot 56 toward the top endof the slide slot 56, thereby causing the steel cable 54 to actuate theinsertion pin 52 to compress the spring 53. The compressed spring 53 isthus located under the end of the locating hole 461. In the meantime,the rear machine stand 42 is swiveled upward on the swiveling shaft 45until the insertion pin 52 is aligned with the second locating hole 462.In light of the recovery spring force of the spring 53, the insertionpin 52 is once again jutted out of the second locating hole 462 to fixthe rear machine stand 42. The folded machine 20 can be then pushed onthe moving wheel 62 of the elevating leg frame 60 to a desired location.

[0016] In operation, the rear machine stand 42 is exerted on by theweight of a user thereof such that a forward moment of force is broughtabout by the reaction force of the rear machine stand in relation to theswiveling shaft 45. In light of the moving wheel 62 being connected viathe elevating leg frame 60, the reaction force relative to the ground isconcentrated on the front machine stand 41. The moving wheel 62 islocated behind the swiveling shaft 45. Therefore, a reverse moment offorce is brought about by the reaction force in relation to theswiveling shaft 45, thereby resulting in the cancellation of the forwardmoment of force by the reverse moment of force. The insertion pin 52 ofthe fixation mechanism 51 of the front end of the rear machine stand 42is retained in the locating hole 461 so as to enable the contactsurfaces of the front machine stand 41 and the rear machine stand 42 topress against each other. These two contact surfaces press against eachother more intimately at the time when the rear machine stand 42 isexerted on by a greater load. As a result, the front and the rearmachine stands 41 and 42 are kept in the stable state.

[0017] As shown in FIG. 5, an increase in the resistance force againstthe jogging motion of an exerciser is effected by the oil pressurecylinder 47 which actuates the piston rod 48 to move inward, therebycausing the elevating leg frame 51 to move upward to raise the rearmachine stand 42. In the elevating process, a friction force is broughtabout to resist the downward slide. As a result, the exercise mustresort to a greater effort to do the jogging exercise on the rearmachine stand 42.

[0018] As shown in FIG. 6, an elevating leg frame 70 of the secondpreferred embodiment of the present invention comprises a firstconnection rod 71 and a second connection rod 72. The first connectionrod 71 is fastened pivotally at one end with a pivoting point 73 of thefront machine stand 41, and at other end with a moving wheel 74. Thesecond connection rod 72 is connected at one end with the piston rod 48,and is pivoted at other end with the first connection rod 71. Theup-and-down motion of the elevating leg frame 70 is effected by the oilpressure cylinder 47, so as to adjust the inclination of the machinestand 40.

What is claimed is:
 1. A foldable jogging machine comprising: a handrailframe; a machine stand fastened with said handrail stand and providedwith a front spindle, a rear spindle, and a track connecting said frontspindle and said rear spindle; wherein said machine stand is formed of afront machine stand, a rear machine stand, and a swiveling shaft onwhich said front machine stand and said rear machine stand swivel, saidfront machine stand and said rear machine stand being provided with acontact surface, said machine stand further being formed of an elevatingleg frame fastened with said front machine stand to bring about areverse moment of force by a reaction force relative to said swivelingshaft at the time when said machine stand is exerted on by the weight ofan exerciser whereby said reverse moment of force cancels out a forwardmoment of force brought about by the exerciser's weight in relation tosaid swiveling shaft.
 2. The machine as defined in claim 1, wherein saidfront machine stand and said rear machine stand are mounted pivotally onsaid swiveling shaft such that said front machine stand and said rearmachine stand can be swiveled to be in the same plane.
 3. The machine asdefined in claim 1, wherein said elevating leg frame is provided with amoving wheel for lifting said machine stand.
 4. The machine as definedin claim 1, wherein said front machine stand is provided with a locatinghole; wherein said rear machine stand is provided with a fixationmechanism whereby said fixation mechanism is retained in said locatinghole to enable said contact surfaces of said front machine stand andsaid rear machine stand to join together intimately.
 5. The machine asdefined in claim 4, wherein said fixation mechanism comprises aninsertion pin and a spring urging said insertion pin, with saidinsertion pin being fastened with one end of a steel cable which is putthrough said spring, said steel cable being fastened at other end with acontrol knob slidably disposed in a slide slot such that said controlknob is slid in said slide slot to actuate said steel cable to extractsaid insertion pin out of said locating hole, or to retract saidinsertion pin into said locating hole.